Mikan's Little Twin

Akako Sakura had to move out of her home town at the age of six. She didn't want to, but it was the only way to protect her older twin sister, Mikan.
Their grandpa allowed them to send letters and see each other every once in a while, but Akako and her grandpa thought it'd be best to stay away.
Akako loved her older sister, but thought it best since she has an alice. She knew some of the last, but not all. And she didn't want her sister to be revealed to it all.
A year later, she gives up her freedom to save two other Alice's. Her efforts are in vain because a year after that, the two Alice's she saved are now in the academy.
But what will happen to her life when her sister enters the picture two years later? How will Akako be able to keep her sister safe from the horrors of the academy?
Read to find out.